CJ750 sidecar-WWII based BMW R71 and R75 replica

Discussion in 'Hack Vendors' started by MichaelLi, Apr 24, 2010.

  1. Tigris_GER

    Tigris_GER Adventure-Finder

    Joined:
    Aug 27, 2013
    Oddometer:
    105
    Location:
    Kharkiv / Ukraine

    I am a little bit surprised at the moment that the Chang Jiang is advertised as a copy of WW II motorbike BMW R75. In fact it is a copy of BMW R71 which was produced from the early 1930ies until 1938 when BMW was ordered to stop the production of civilian motorbikes (including R71) and to concentrate on the production of military motorbikes such as the R75.

    The BMW R71 was a pure civilian motorbike developed and produced in a time when Germany still accepted the restrictions of the Versailles Treat (after WW I) not to produce any military equipment.

    The construction plans for the R71 went to Sowjet Union beginning of the 1940ies, most likely as a part of the Hitler-Stalin Treat although this is not really clear how they came to SU. In SU the motorbike was produced under the name M72 (No - "M" ist not the abbreviation of the SU Foreign Minister Molotov who signed the Hitler-Stalin Treat in the Name of SU but for the Russian word мотоцикл (motozikl) = motorbike). Later the SU government forwarded the plans to their socialist brothers in China.

    In 1938 German government ordered German motorcycle producers to develop a pure military motorbike according to very detailed technical specifications. BMW tried to improve the R71 according to these specifications whilst German motorbike producer Zündapp developed a brand new motorbike, Zündapp KS750.

    Zündapp won the competition and was awarded with the contract of the German government and BMW was ordered to produce the Zündapp KS 750 in BMW factories in license what they did under the name BMW R75.

    Comparing BMW R75 and R71 but also M72 and Chang Jiang you can see that the concepts are totally different. The frame, the front fork etc. What they all make look similar is the characteristic look of the 2-cylinders boxer engine and the sidecar - and that´s it. Technically we are talking about different worlds.

    Kind regards from Kabul
    #41
  2. gspell68

    gspell68 Long timer

    Joined:
    May 8, 2008
    Oddometer:
    19,814
    Location:
    Georgia (The State, not the Country)
    Yep.
    R-71 tubular frames don't hold up well to off road beatings. The easiest way to tell a BMW R-71 from the Russian M-72 or Chinese CJ-750 is that the latter two re-inforced the rear gusset near the plungers. The very first upgrade the Soviets made to the M-72 was to change the rear suspension to a swingarm and call it a K-750.
    And look at the German war bikes: the BMW R-12 and the Zundapp KS-750 both had stamped metal flex frames and the the BMW R-75 had modular, bolted-joint, sectional frames to withstand the rigors that a true, off-road tactical vehicles would've been exposed to...
    #42